2,4-Bis(trifluoromethyl)-6-nitrophenol compounds

ABSTRACT

Novel 2,4-bis-(trifluoromethyl)-6-nitrophenol compounds of the formula   IN WHICH X is hydrogen; M; HNR 1R2R3; -COR4; -COOR5; N,Ndimethylaminocarbonyl; -SO2R6 or -CO-NH-R7; M is an equivalent of an alkali metal or alkaline earth metal, R1, R2 and R3 (individually) are hydrogen, alkyl, alkoxyalkyl, alkenyl, hydroxyalkyl, cycloalkyl, phenyalkyl, phenyl or substituted phenyl, R4 and R5 individually are alkyl, substituted alkyl, alkenyl, phenyl or substituted phenyl, R6 is alkyl, substituted alkyl, phenyl, substituted phenyl or dimethylamino, and R is alkyl, alkenyl, cycloalkyl, phenyl or substituted phenyl; ARE OUTSTANDINGLY EFFECTIVE SELECTIVE HERBICIDES.

United States Patent 9] Wagner et al.

[451 July 8,1975

[ 2,4-BIS(TRIFLUOROMETHYL)-6- NITROPHENOL COMPOUNDS [75] lnventors: Klaus Wagner; Ludwig Eue; Robert R. Schmidt; Ernst Rees, all of Cologne, Germany [73] Assignee: Bayer Aktiengesellschatt,

Leverkusen, Germany [22] Filed: Feb. 23, 11973 [21] Appl. No.: 335,400

[30] Foreign Application Priority Data Feb. 29, 1972 Germany 1. 2209528 [52] US. Cl 260/468 E; 71/103; 71/108; 71/111; 71/122; 260/463; 260/471 R;

260/471 C; 260/479 R; 260/479 C; 260/505 R; 260/513 N; 260/567.5; 260/622 R [51] Int. Cl. C07c 125/06 [58] Field of Search 260/479 C, 471 C, 468 E [56] References Cited UNITED STATES PATENTS 4/1960 Lambrech 7l/2.6 7/1969 Popoff et a1. 71/103 Primary Examiner-James Av Patten Attorney, Agent, or FirmBurgess, Dinklage & Sprung [5 7] ABSTRACT Novel 2,4-bis-(trifluoromethyl)-6-nitrophenol compounds of the formula in which X is hydrogen; M; HNR R R COR"; COOR N,N-dimethylaminocarbonyl; SO R or -CO-NH]R M is an equivalent of an alkali metal or alkaline earth metal,

7 Claims, No Drawings 1 2,4-BIS(TRIFLUOROMETHYL')=6-NITROPHENOL COMPOUNDS" The present invention relates to certain new 2,4-bis- (trifluoromethy l)-6-nitrophenol compounds, to herbicidal compositions containing them and to their use as herbicides.

ft is known that 2,4-dinitro-6-alkylphenol derivatives,

for example 2,4-dinitro-6-sec.-butylphenol acetate (Dinoseb acetate) (cf. Deutsche Auslegeschriften (German Published Specifications) 1,088,757 and 1,103,072), can be used as herbicides. H y M y The present invention provides 2,4-bis (trifluoro rne thyl)-6-nitrophenol derivatives of the general formula in which X is hydrogen; M; HNR TPNR (i.e., quaternary ammonium); 'C OR (i.e., hydrocarbylcarbonyl); COOR (i.e., hydrocarbyloxycarbonyl), N,N dimethylaminocarbonyl; SO lR (i.e., substituted sulfonyl); or -CO-NH- R (i.e., hydrocarbylamido), I

M is an equivalent of'an' alkali metal or alkaline earth metal,

R, R and R (which may be the same or different.)

are hydrogen, alkyl, alkoxyalkyl, alkenyl, hydroxyalkyl, cycloalkyl, phenylalkyl, phenyl or substituted phenyl,

R and R individually are alkyl, substituted alkyl, alkenyl, phenyl or substituted phenyl,

R is alkyl, substituted alkyl, phenyl, substituted phenyl or dimethylamino, and

R is alkyl, alkenyl, cycloalkyl, phenyl or substituted phenyl.

Surprisingly, the new 2,4-bis-(trifluoromethyl)-6- nitrophenol derivatives show stronger herbicidal properties than the previously known 2,4-dinitro-6- alkylphenol derivatives and moreover are also of good effectiveness selectively. The active compounds according to the invention thereforerepresent a valuable enrichment of the art. I i

Preferred, because of their high activity, are compounds wherein M is lithium, potassium or sodium or an equivalent of a calcium or barium ion; R, R and R are hydrogen, alkyl of from 1 to 12 carbon atoms, alkoxyalkyl of from 1 to 4 carbon atoms in each of the alkoxy and alkyl moieties, alkenyl of from 2 to 4 carbon atoms, cycloalkyl of from 5 or 6 carbon atoms in the ring system, phenylalkyl of from 1 or 2 carbon atoms in the alkyl moiety, or for phenyl (which may be substi- /or methyl); R and R arealkyl of from I to 12 carbon atoms, or for (possibly substituted by chlorine, bromine or trifluoromethyl) alkyl offrom l to 12 carbon atoms or alkenyl of from 2 to 4 carbon atoms, or for phenyl (which may be substituted by chlorine, bromine, trifluoromethyl, nitro and/or methyl); R is C alkyl which may be substituted by chlorine, bromine or .trifluoromethyl, or R" is phenyl (which may be substituted by chlorine, bromine, I trifluoromethyl, nitro and/or methyl) or dimethylamino; and R7 is alkyl of from 1 to 4 carbon atoms, alkenyl of fror n 2 to 4 carbon atoms, cycloalkyl of from 5 or 6 carbon atoms in the ring system or for phenyl (which may be substituted by chlorine, bromine, trifluoromethyl, nitro and/or methyl).

The invention also provides a process for the production of a 2,4-bis-(trifluoromethyl)-6-nitrophenol derivative of formula (I) (in which X is not hydrogen) in which process 2,4-bis-(trifluoromethyl)-6-nitrophenol of the formula is reacted with the appropriate member'of the following group of compounds:

a. a compound of the formula M-OH (Ill) b. an amine of the formula a -n trv) 0. an acid chloride of the formula RCOC1 d. a chloroformic acid ester of the formula R"OCOC1 e. dimethylcarbamic acid chloride of the formula 1: VT- /N-COC1. CH

f, a s ulphonyl chloride of the formula R"'SO Cl (VIII) g. an isocyanate of the formula 7 R N I- -O (nov the symbols M and R to R in the formulae (Ill-IX) possessing the meanings stated above. The reaction may be effected optionally in the presence of a diluent and optionally in the presence of an acid-binding agent.

3 v 4 The reaction is of a type which is known per se, and it lf according to process variant (e), N ,N-dimethylmay be effected in any convenient way. represent a carbamic acid chloride is used as starting material, the valuable enrichment of the art. following formula scheme applies:

'5 VF -rrc1 I -M -----a F C -Q0oON\CH- 2 N O 0 &

lf, according to process variant (a), sodium hydroxaccording to Process Valiant me haneide is used as starting material, the reaction course is sulphochloride is used, the reaction course can be rep? represented by the following scheme: resented. y the followmg schemei '3 /,5 F 0 0H NaOH F 0 0 Na 3 0 N0 V N0 -HCL A N F C -OH 131.50 .351 P G-( ,-)O-Su oh.

If in process variant b), trimethylamine is used, the if, a c rd g to Process Variant (g), m t y is yanate reaction proceeds according to the following scheme: is used, the reaction proceeds as follows:

13s on ex m; v c.

F C OH CH -NCO F C Z-O--CONH--CH- 2 rro lf, according to process variant ('c), crotonic acid The starting materials are unambiguously defined by chloride is used, the reaction course can be represented the formulae (ll) to (IX). 7 y following 5611611161 The 2,4-bis-(trifluoromethyl)-6-nitrophenol of. the

CF v v i 3! 4101 r .H r-. ,'"!1 h F OH hawcH-QH o 3 r 0 0 W A CHZH lrO v No If, according to process variant (d),- chloroformic formula (I equired as active compound or as starting acid ethyl ester is used, the reaction course can be repa e ial o e Othe ompounds can readily be preresented by the following scheme: pared according to the present invention by reaction of o-cooc 2B5 2,4-bis-(trifluoromethyl)-6-nitrochlorobenzene (known from the literature) with an alkali, for example 2 moles of sodium hydroxide in boiling methanol (cf. Example I):

NaOH CH on F5C c1 ..l F

The compounds of the formula (III) are known. Examples include: lithium, sodium, potassium and calcium hydroxide.

The compounds of the formula (IV) are known. Examples include: ammonia, dimethylamine, diethylamine, triethylamine, dicyclohexylamine, butylamine and Z-hydroxypolylamine.

The acid chlorides of the formula (V) are described in the literature. Examples include: acetyl, trifluoroacetyl, propionyl, oz-chloropropionyl, n-butyryl chloride, acrylic acid chloride, methacrylic acid chloride, dimethyl-acrylic acid chloride, crotonyl, benzoyl, pchlorobenzoyl, o-nitrobenzoyl and m-toluyl chlorides.

The chloroformic acid esters of the formula (VI) are likewise known. Examples include: chloroformic acid methyl, ethyl, propyl, isopropyl, n-butyl, n-hexyl and phenyl esters.

The sulphochlorides of the formula (VIII) are likewise known from the literature. Examples include: methane-, chloromethane-, ,B-chloroethane-sulfonyl chloride, benzene-, 3,4-dichlorobenzeneand 4- chlorobenzenes-sulfochlorides.

The isocyanates of the formula (IX) are also known from the literature. Examples include: methyl, ethyl, propyl, butyl, allyl, cyclohexyl, phenyl, 3-chlorophenyl and 4-nitrophenyl isocyanates.

Preferred diluents, for the process variants (a) and (b) are water/(3 alcohol mixtures; and, specifically for process variant (b), inert organic solvents, such as benzene, acetone, acetonitrile.

For the process variants (c) (g), preferred diluents are inert organic solvents. These include hydrocarbons, such as benzene, chlorobenzene, toluene and xylene; others, such as diethyl ether, dibutyl ether, tetrahydrofuran and dioxan; esters, such as ethyl acetate; ketones, such as acetone and methyl ethyl ketone; and nitriles, such as acetonitrile and propionitrile.

Process variants (a) and (b) are susually so carried out that a solution of the 2,4-bis-(trifluoromethyl)-6- nitrophenol in one of the solvents mentioned is reacted portionwise with at least the equimolar amount of a compound of the formula (III) or (IV).

Process variant (c) to (f) are preferably so carried out that a solution of 2,4-bis-(trifluromethyl)-6- nitrophenol in one of the solvents mentioned is provided in the presence of an acid-binding agent, preferably a tertiary amine such as triethylamine, N,l l-dimethylbenzylamine, diethylaniline, pyridine, picoline or quinoline or an alkaline-reacting inorganic substance such as potassium carbonate or sodium carbonate, and the reactive chlorine compound concerned of the for mulae (V) to (VIII) is added portionwise, with stirring.

Process variant (g) is usually so carried out that a solution of the 2,4-bis-(trifluoromethyl)-6-nitrophenol in one of the solvents mentioned above is reacted portionwise, in the presence of a catalyst, preferably triethylamine, with an isocyanate of the formula (IX). The starting materials are preferably used in stoichiometric amounts.

The reaction temperatures in all process variants can be varied within a fairly wide range. In general, the reaction is carried out in a range from 10 to +120C, preferably +10 to +80C.

The working up of the reaction mixtures may be carried out in customary manner. The purification of the reaction products can, if necessary, be effected by recrystallization from organic solvents, in particular from alcohols such as methanol or ethanol.

The preparation of the compounds of the invention is illustrated by the following Examples.

EXAMPLE 1 Preparation of 2,4-bis(trifluoromethyl)6-nitrophenol phenol v T75 a CE ,1 r 2 To a solution of 168 g (4 moles +5% excess) of sodium hydroxide in 1000 ml methanol there were added portionwise, at 50-65C internal temperature, 586 g (2 moles) 2,4-bis-trifluoromethyl-6- nitrochlorobenzene; the reaction mixture, after completion of addition (about 1 hour) of the reactive chlorine compound, was boiled under reflux for one hour. After cooling, 700 ml of water were added to the mixture and unreacted starting materials were extracted once with 400 ml methylene chloride. The aquous phase was separated off, distinct acidification was effected with 20%-strength sulfuric acid; the 2,4-bistrifluoromethyl-6-nitrophenol which separated was taken up in methylene chloride. The organic phase was dried over sodium sulfate. The 2,4-bis-trifluoromethyl- 6-nitrophenol remaining behind after methylene chloride had been distilled off was subjected to vacuum distillation. 480 g (87%) of the boiling point -l06C/2O mm Hg were obtained; refractive index n 1.4580.

EXAMPLE 2 Preparation of 2,4-bis-(trifluorornethyl)-6-nitrophenyl-sulfonic acid phenyl ester 7 To a solution of 55 g (0.2 mole) 2,4-bis-(trifluorome- .thyl)-6-nitropheno1, in 160 ml acetonitrile were added 16 g (0.1 mole excess) of dry potassium carbonate, and heating to 7080C was effected for minutes. The reaction mixture was cooled to 10C and 35.2 g (0.2 mole) benzenesulphonyl chloride were added and the mixture was kept at 6070C for 6 hours. After cooling, pouringinto ice water was effected and the precipitated 2,4-bis-(trifluoromethyl)6-nitrophenylsulfonic acid phenyl ester was filtered off with suction. 67 g (80%) of the product were obtained in the form of colorless crystals of the melting point 83-84C.

EXAMPLE 3 Preparation of 2,4-bis-( trifluoromethyl )-6-nitrophenyl-N- methylcarbamate Cl? (Combo-11:1: F C o-co-im-sn EXAMPLE 4 Preparation of 2,4-bis-(trifluoromethyl)-6-nitro-phenol triethylammonium salt (Compv unc To a solution of 275 g (1 mole) 2,4-bis-(trifluoromethyl)-6-nitrophenol in 500 ml benzene there were added portionwise (exothermic) 100 g (1 mole +10% excess) triethylamine. The mixture was afterwards stirred for 3 hours at C and excess solvent was removed in a vacuum. 376 g 100%) of triethylammonium salt of 2,4-bis-(trifluoromethyl)-6-nitrophenol were obtained in the form of an orange oil of the refractive index n 1.4895.

In analogous manner, the 2,4-bis-(trifluoromethyl)- 6-nitrophenol derivatives of the following Examples 5-28 were prepared. 1

Table Example x- 1" Melting point 00 5 coocH, 63-65 6 cooc l-l 52-53 7 coo 1 c,1-1 4748 s coo c,H,-n 1 34-35 9 COOCH2CH2C1 64-66 10 COCH,, 72-73 11 coc u 38-40 12 co-c.,11 73-75 1 3 COCH=CHCH 62-64 14 co c11=c11 42.43 15 so -c11, 6264 16 CONHC,-,H n 93 17 CO-NHC,,HS 105-107 1 s CONHC H -Cl(m) 98-99 19 CO-NH-C,,H,Cl(p) 1 12-1 13 20 CO-NH-QH, 104-106 21 co N1-1 c,1-1 ,-n 7980 22 CO-NH- 98-99 23 co-c,1-1,-c1 o 93 25 1-1 1 1 c11,-c11 -c11,, 139440 0H 26 H;,NC4H,, 176-177 The IR and NMR spectra agreed completely with the structures given for Examples l-28.

The active compounds according to the invention exhibit strong herbicidal properties and can therefore be usedfor the control of weeds. By weeds in the widest sense are meant all plants which grow in places where they are not desired. Whether the substances according to the invention act as total or selective herbicides depends largely on the amount applied.

The substances according to the invention can be used for example in the case of the following plants: dicotyledons, such as mustard (Sinapis), cress (Lepidium), cleavers (Galium), chickweed (Stellaria), chamomile (Matricaris), gallant soldier (Galinsoga), goosefoot (Chenopodium), annual nettle (Urtica), groundsel (Senecio), cotton (Gossypium), beets (Beta), carrots (Daucus), beans (Phaseolus), potatoes (Solarium), coffee (Coffea); monocotyledons, such as timothy (Phleum), bluegrass (Poa), fes'cue (Festuca), Eleusine (Eleusine), foxtail (Setaria), ryegrass (Lolium), cheat (Bromus), barnyard grass (Echinochloa), maize (Zea), rice (Oryza), oats ('Avena), barley (Hordeum), wheat (Triticum), millet (Panicum), sugar cane (Saccharum).

The active compounds are particulatly well suited for the selective control of weeds in cotton and cereals, including maize. v

The active compound according to the present invention can be converted into the usual formulations, such as solutions, emulsions, suspensions, powders, pastes and granulates. These may be produced in known manner, for example by mixing the active compounds with extenders, that is, liquid or solid or liquefied gaseous diluents or carriers, optionally with the use of surfaceactive agents, that is, emuslifying agents and/or dispersing agents, and/or foam-forming agents. In the case of the use of water as an extender, organic solvents can,

for example, also be used as auxiliary solvents.

As liquid diluents'or carriers, there "are preferably used aromatic hydrocarbons, 'such as xylenes, toluene,

benzene or alkyl napthalenes, chlorinated aromatic or aliphatic hydrocarbons, such as chlorobenzenes, chloroethylenes or methylene chloride, aliphatic hydrocarbons, such as cyclohexane or paraffins, for example position containing as active ingredient a compound according to the invention in admixture with a solid or liquefied gaseous diluent or carrier or in admixture with a liquid diluent or carrier containing a surfacemineral oil fractions, alcohols, suchas butanol or glycol aCtivQ g i as well as their ethers and esters, ketones, such as aceinvention 8180 Pr0Vid6S a method of Combating tone, methyl ethyl ketone, methyl isobutyl. ketone or Weeds W c Comprises pp y g to t Weeds their cyclohexanone, or strongly polar solvents, such as dihabitat a compound according to the invention alone methyl formamide, dimethyl sulfoxide or acetonitrile, in the form of a Composition Containing as active as well as water. gredient a compound according to the invention in ad- By liquefied gaseous diluents or carriers are meant mixture with a diluent of carrierliquids which would be gasous at normal temperatures The invention also Provides meansof Providing Crops and pressures, e.g., aerosol propellants, such as halogepl'oteeteCl from damage y Weeds y being grown in nated hydrocarbons, freon, areas in which, immediately prior to and/or during the As solid diluents or carriers, there are preferably time of the g a eompouhd according to the used ground natural minerals, such as kaolins, clays, Vehttoh was pp alone or in admixture with a talc, Chalk, quartz, attapulgitq montmol-inonite or ent or carrier. it will be seen that the usual methods of tomaceous earth, or ground synthetic minerals, such as Providing a harvested p y be improved y the highly dispersed silicic acid, alumina or silicates. Present myehtteh- Preferred examples of emulsifying and foam-forming The Compounds according to the invention and the agents include non-ionic and anionic emulsifiers, such Preparation t use of the eompeuhds'aeeol'dmg to the as l th l j tt i esters, polyoxyethylene invention, are illustrated by the following Examples. in fatty alcohol ethers, for example alkylarylpolyglycol Table A and B the numbers of eompeuhds ethers, alkyl sulfonates, alkyl sulfates and aryl sulfobrackets) are those of the eorl'espehdmg Preparatlve nates as well as albumin hydrolyzation products; and Examplespreferred examples of dispersing agents inlcude lignin, sulfite waste liquors and methyl cellulose. Example A The active compounds according to the invention pre emergence test may be present in the formulations in admixture with Solvent; 5 pal-ts by weight acetong' other actwe cotnpounds' Emulsifier: 1 part by weight alkylarylpolyglycol ether The formulations contain, in general, for 0.1 to 95 To produce a Suitable ra i f active P Cent y Weight f active Compound, preferably 05 pound, 1 part by weight of active compound was mixed to 90 Per P by welghtwith the stated amount of solvent, the stated amount of The aetlve Compounds y be pp as such or in emulsifier was added and the concentrate was then dithe form of their formulations or the application forms lutedwith Water to the desired concentration P p therefrom, Such as y' solutions, Seeds of the test plants were sown in normal soil and, emulsibhs, Suspensions, Powders, pastes and g after 24 hours, watered with the preparation of the aclates- Appheatieh y take Place in the usual manner, tive compound. lt was expedient to keep constant the for example y Watering Spraying, atemizmg, dusting amount of water per unit area. The. concentration of or seattetmg- 40 the active compound inthe preparation was of no im- The active compounds aeeerdmg t0 the invention portance, only the amount of active compound applied may be applied both according to the pre-emergence per unit area being decisive. After three weeks, the demethod and according to the post-emergence method, gree of damage to the test plants was determined and that is to y before of after emergence of the pl n characterized by the values O5, which have the follow- When the active compounds are used either accordi a i ing to the post-emergence method or the pre- 0 no ff t emergence method, the amount applied can be varied 1 li h damage of'delay in wt 7 within fairly wide ranges. ln general, it is from 0.5 to 15 210 marked damage or inhibition of growth kg of active compound per hectare, preferably 1 to 6 3 heavy damage and only deficient development or kg per hectare. only 50% emerged The active compounds according to the invention 4 plants partially destroyed after germination or also exhibit a fungicidal, bactericidal and soilonly 25% emerged I insecticidal activity; they further possess an effective- 5 plants completely dead or nor emerged. ness against plantdamaging insects and mites as well as The active compounds, the amounts applied and the against hygiene pests and pests of stored products. results obtained can be seen from the following Table The invention therefore provides a herbicidal com- A,

Table A Pre-emergence test Active compound Active com- Chenopo- Sinap- Stella- Galin Matrica- Cotton Wheat Maize pound applied dium is ria soga ria kg/hectare O C O C H 3 0 M C H 2 H 5 5 3 5 2 4 i 5 2 2 2 'l 2.5 l 4 l 3 5 l l 2 Example B Post-emergence test which are stated in the Table were applied. Depending on the concentration of the spray liquor, the amount of water applied lay between 1,000 and 2,000 litres/hectare. After three weeks, the degree of damage to the Solvent; 5 parts by i h acetone 5 plants was determined and characterized by the values Emulsifier: 1 part by weight alkylarylpolyglycol ether hICh have the following me ni To produce a suitable preparation of active com- 0 no ffect pound, 1 part by weight of active compound was mixed 1 a few shghtly burnt spots with the stated amount of solvent, the stated amount of 10 2 marked damage to leaves emulsifier was added and the concentrate was then di- 3 some a es and parts of stalks partially d d luted with water to the desired concentration. 4 plant partially destroyed Test plants which has a height of 5-15 cm were 5 P ant Completely dead. sprayed with the preparation of the active compound The aCUVe mpo nds, the amounts applied and th so that the amounts of active compound per unit area 5 results can be Seen from the followmg Table 3 Table B Post-emergence test Active compound Active com- Echinoch- Chenopo- Sinap Unica Matri- Dau- Cotton Wheat pound applied toa dium 1s cana cus kg/hectare 0.,N 2 1 5 5 5 0 4 2 2 o C CH3 1 1 5 5 3 0 3 2 2 \Tl1lC H CH3 (known: Dinoseb acetate) F C 2 5 5 5 5 4 5 2 2 Q 1 4 4 5 5 3 5 0 1 F.C 5 5 5 5 5 5 l 2 .1 Q COCH 1 3 4 5 5 4-5 4-5 5 0 1 FC 2 45 5 5 5 5 5 l 2 g 2' 2' 1 3 5 5 3-4 4-5 4 5 0 1 5 5 5 4 5 O 1 EC @0400 n 1 4 4 5 4 3 5 0 0 Table B Continued I 1 Post-emergence test Active compound Active com- Echinoch-- Chenopo- Sinap- Urtica Matri-- Dau- Cotton Wheat pound applied loa dium is' caria cus kg/hectare F C l 2 5 5 s 5 3 5 3 1 I OCONHH 4 5 4 2 5 0 2 CF3 FC i e 6) 2 5 5 5 5 4 5 1 2 a o HN (C2H5)3 1 1 3-4 4 5 4 3 5 0 1 It will be understood that the specification and exam- R is alkyl of from 1 to 4 carbon atoms, alkenyl of ples are illustrative but not limitative of the present infrom 2 to 4 carbon atoms, cycloalkyl of from 5 to vention and that other embodiments within the spirit 6 ing carbons, or phenyl. and scope of the invention wlll Suggest themselves to 2. Compound as claimed in claim 1 wherein R is althose skilled in the art. ky].

what lsflanlled ls: 3. Compound as claimed in claim 1 wherein R is al- 1. 2,4-b1s-(tr1fluoromethyl )-6-n1trophenol compound ken of the formllla 4. Compound as claimed in claim 1 wherein R is cycloalkyl. 5. Compound as claimed in claim 1 wherein R is v phenyl. ,F C- O- i 6. Compound as claimed in claim 1 wherein X is I v N,N-dimethylaminocarbonyl.

NO l 7. Compound as claimed in claim 1 designated 2,4-

2 bis-(trifluoromethyl)-6-nitro-phenyl-N- methylcarbamate.

wherein l 40 X is N,N-dimethylaminocarbonyl or -C0N- v H-R and =1: 

1. 2,4-BIS(TRIFLUOROMETHYL)-6-NITROPHENOL COMPOUND OF THE FORMULA
 2. Compound as claimed in claim 1 wherein R7 is alkyl.
 3. Compound as claimed in claim 1 wherein R7 is alkenyl.
 4. Compound as claimed in claim 1 wherein R7 is cycloalkyl.
 5. Compound as claimed in claim 1 wherein R7 is phenyl.
 6. Compound as claimed in claim 1 wherein X is N,N-dimethylaminocarbonyl.
 7. Compound as claimed in claim 1 designated 2,4-bis-(trifluoromethyl)-6-nitro-phenyl-N-methylcarbamate. 